Function getTokenComparator

src/util/getTokenComparator.ts:9–35

(
  selectionDisplayLine: number,
  selectionCharacterIndex: number
)

 * @param selectionCharacterIndex The character index of current cursor within line
 */
export function getTokenComparator(
  selectionDisplayLine: number,
  selectionCharacterIndex: number
): (a: Token, b: Token) => number {
  return (token1, token2) => {
    const token1LineDiff = Math.abs(token1.displayLine - selectionDisplayLine);
    const token2LineDiff = Math.abs(token2.displayLine - selectionDisplayLine);

    if (token1LineDiff < token2LineDiff) {
      return -1;
    }

    if (token1LineDiff > token2LineDiff) {
      return 1;
    }

    const token1CharacterDiff = Math.abs(
      token1.range.start.character - selectionCharacterIndex
    );

    const token2CharacterDiff = Math.abs(
      token2.range.start.character - selectionCharacterIndex
    );

    return token1CharacterDiff - token2CharacterDiff;
  };
}